I went to my lfs today to get 4 mollies for my tank ( 1 male and 3 females). I am hoping to breed them but when I got home I found a Guppy fry which was no bigger than my finger nail as well as all the Mollies. But I am wondering if when it grows up it might breed with my male molly and make a hybrid. Also if it does would the hatchlings be deformed or unwell?

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im 13 and have a 34litre aqua one tank which has:
FISH